"Phil Cook" <phi### [at] nospamrocainfreeservecouk> wrote in message 
news:op.t6tif914c3xi7v@news.povray.org...
> And lo on Wed, 20 Feb 2008 09:46:16 -0000, Invisible <voi### [at] devnull> did 
> spake, saying:
>> So what does "calculus" actually mean?
>
> Small stone, used for counting; IOW counting small 'things'.

Hard deposits of bacterially-displaced calcium carbonate that the dentist 
scrapes off your teeth.

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